weight LOSS. Advice?

I'm 8 weeks today. This is my 3rd pregnancy. I never had any nausea or morning sickness with my first 2 pregnancies. But this time, since I hit about 5-6 weeks, EVERYTHING makes me sick. I wake up so nauseous. Even drinking water makes me feel awful. And just in those 2-3 weeks, I've LOST 7 pounds. Now, my BMI IS overweight, so it isn't a huge deal that I've lost the weight. However, I'm concerned about how much nourishment baby is missing out on. I dont see my Dr for a few weeks and im desperate for some relief. I'm taking vitamins, but other than that...does anyone have any ideas or suggestions to help with this? Thanks, ladies :)